New Tools Help Find Flaws

by Kneeland A. Godfrey, Jr., Sr. Editor; Civil Engineering Magazine, ASCE World Headquarters, 345 East 47th Street, New York City, NY.,

Serial Information: Civil Engineering—ASCE, 1984, Vol. 54, Issue 9, Pg. 39-42

Document Type: Feature article


Certain electromagnetic tools for nondestructive evaluation of existing infrastructure, though not widely used, can cut cost and time of identifying flaws in existing infrastructure. Five such tools are described, with their limitations, and case histories illustrate their use. Infrared thermography senses temperature differences in delaminated areas of bridge decks. Ground penetrating radar can measure depth of subpavement voids and cavities formed around pipes. Acoustic emission detects flaws in structures and leaks in pressure water pipes. Electrical resistivity can pinpoint leaks within a dike. Streaming potential can show the extent of a leachate plume in groundwater.

Subject Headings: Water pressure | Infrastructure | Case studies | Bridge decks | Pipe leakage | Pressure pipes | Imaging techniques | Thermal effects

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